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(al <br /> 4 <br /> STLSubmission# 2003-10-0434 <br /> i <br /> GasIBTEX Fuel Oxygenates by 82606 <br /> TRC Alton Geoscience <br /> Attn Anju Farfan <br /> 21 Technology Drive <br /> Irvine, CA 92718 <br /> Phone (949)341-7440 Fax (949)753-0111 <br /> Project 410500-01 Received 10/10/2003 15 37 <br /> 01205 <br /> Site 16470 Cambridge St, Lathrop CA <br /> a <br /> Batch QC Report <br /> Prep(s)_ 50306 u � Test(s)e8260FA8, <br /> . s <br /> N <br /> Laboratory Control Spike z z g,' Water QC Batch#,2003/10123-0168 <br /> > h <br /> LCS 2003110123-01 68-027rJr'.r A, j , 'Extracted,10/2312003 �`"r Analyzed ,10/2312003,11 27 <br /> , , <br /> LCSD 2003/10/23-01,68-047, ExacterYd 40/23/2F6'03- <br /> 0/2312F0•'03 r a `tAv nf az'ed' <br /> 10/23/2003 11 47 <br /> Compound Cone ug/L Exp Cone Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Benzene 225 224 25 0 900 896 0 4 69-129 20 <br /> Toluene 234 235 25 0 936 94 0 0 4 70-130 20 <br /> Methyl tort-butyl ether(MTBE) 228 218 25 0 91 2 872 4 5 65-165 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 505 496 500 1010 99 2 76-114 <br /> Toluene-d8 515 532 500 1103 0 106 4 1 86-110 <br /> Severn Trent Laboratories, Inc 10/24/2003 14 01 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton CA 94566 <br /> AW a S—M T—A Plc Tel 925 484 1919 Fax 925 484 1096.www stl Inc com-CA DHS FLAP#2496 Page 12 of 13 <br />